Furnace-grate.



D. J. MCKBNZIE.

FURNACB GRATB.

APPLIOATION FILED MAR. 12, 1909.

Patented Mar. 3, 1914.

/fv enfer QW/z 5y I l VITE" STATES OFFTGE.

IDOUGAL J. MCKENZIE, 0F CHICAGO, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS, TO CHICAGO TITLE ANI) TRUST COMPANY, 0F CHICAGO, ILLINOIS, A CORPORA- TION OF ILLINOIS.

FURNACE-GRATE.

Specification of Letters Patent.

Patented Mar. 3, 1914:.

To all whom it may concern Be it known that I, DOUGAL J. McKenzie, a citizen of the United States, residing at Chicago, in the county of Cookand State of Illinois, have invented certain new and useful Improvements in Furnace- Grates, of which the following is a specification.

The principal. object of to provide a new and improved fuel supporting grate for furnaces.

Another object of my invention is to provide a furnace grate that can be readily repaired or renewed when desired.

Still another object is to provide a sectional grate bar.

lilith the foregoing objects in view, together with others which will be more readily apparent in the specification, my invention consists of the combination of elements defined in the appended claims.

In the accompanying drawings I have illustrated an embodiment of my invention, which is one of the forms at present preferred by me.

Figure l is an elevation, partly in section, of a grate bar embodying my improvements. Fig. 2 is a plan view, partly in section, as indicated by the lines a and b in Fig. 3. Fig. 3 is an elevation of one of the fuel supporting members. Fig. 4 is an elevation of a special form of a fuel supporting element used at the end of the bar, having a plurality of transverse ribs. Fig. 5 is a section on the line c-c in Fig. 2.

In my improved grate there are a plural ity of bars 15, one of which is illustrated m the drawings. Each bar 15 has its ends 16 and 17 somewhat reduced in size and adapt ed to rest upon the ash-pit walls. The bar is preferably a rough casting, but on its upper face it is machined, so as to provide a projecting rib 18 with notches or grooves 19 at the sides thereof. The fuel supporting members are designated generally by the reference numeral 20. Each such element Q0 has a seat Q1 with lips 29 adapted to fit accurately upon the top face 18-19 of the bar 15. Above the flat seat 21 is an open- 'ng 22, bounded by a strengthening flange 30. The fuel supporting element 20 has laterally projecting fingers 23, as shown 1n Fig. 2, thus providing ample support for fine fuel, and at the same time permitting access of air through the openings between the fingers 23. Each fuel supporting memmy invention is` ber 20 is secured in place upon the bar 15 by means of a bolt 25 through the hole .211 in the bar. The nut 27 for this bolt fits closely in the hole 22, being held there against rotation. The parts may be assembled or taken apart by applying a wrench to the head 26 of the holt. The members Q0 are further secured against displacement by the abutments 28 at the ends thereof.

As shown most clearly in Figs. 1 and Q, plurality of the fuel supporting members 2O may be united in one casting 31. In case these multiple fuel supporting` members are placed at the end of the gratel'iar, as shown in the drawings, an especially heavy bar 32 is provided at the end. At the opposite end of the grate bar 15 the special form of fuel supporting element 31 may be made integral with the said bar 15, as shown in the drawings, if preferred.

The part of the grate bar most likely to deteriorate, by reason of the intense heat or from other causes is at the top where the fuel lies upon it. It will be seen that I have made this part removable and replaceable. Moreover, the change can be effected with extremely little bother, merely by applying a wrench to the bolt heads QG. Even if the nuts 27 should be turned on the bolts, it is very easy to break the bolt by twisting it with a wrench, and the loss of the bolt is insignificant.

This grate bar is adapted tc be used in any kind of a furnace. The bars may be placed with their top surfaces in a horizontal plane or they may be placed with their top surfaces in an inclined plane. The grate formed of these bars is adapted for burning all kinds of fuel, such as coal of various degrees of fineness and various qualities, or wood, or other fuels. These grates may be used under all different kinds of apparatus, such as steam b oilers, kilns, &c. They are also adapted for either hand or automatic stoking. They may be combined in chain grates. They may also he mounted in frames adapted to rock them so as to cause the ashes to pass through into the ash-pit, or they may of course lie-rigidly mounted. All these variations of detail and others are intended to be comprehended under the following claims.

In my Patent Number 610,687 granted to me September 13, 1898, I have disclosed a furnace grate; this application is for an improvement thereon in respect to the structure of the grate bars.

claim l. n a device of the class described, a bar having holes therethrough, transverse fuel supporting members mounted thereon, and bolts through the holes engaging the said members, each of said members having a socket to receive a nut to coact with the bolt, said socket being surrounded by a ange.

2. in a device of the class described, a horizontal bar having a series of Vertical holes therethrough, a series of transverse fuel supporting members mounted upon the -bar over the respective holes, each member having a socket With a lateral opening t0 receive a nut and also having a hole leading to the socket, the holes in the members registering with the holes in the bar, and bolts in these holes With their heads on the underside of the bar and the nuts in the sockets in the said members.

In testimony whereof, I have subscribed my name.

DOUGAL J. MGKENZIE. Vitnesses:

ANNA L. VVALTON, HENRY A. PARKS.

Genies of this patent may be obtained. for five cents each, by addressing the Commissioner of Patents.

Washington, D. C. 

